Complete Valve Catalog
203Pages

Thermoplastic Valves, Actuation & Controls Ball Valves • Butterfly Valves • Diaphragm Valves Globe Valves • Gate Valves • Constant Flow Valves Pneumatic Actuators • Electric Actuators

Product Development and CAE Analysis Fig. A Analysis Conditions: 2 X Recommended Pressure Ambient Temp. MINIMUM DISTORTION A Dedication to Product Improvement Our goal has been to design valves that will last longer than anyone else's, even in the worst kind of corrosive service. We feel we have achieved this, but we are also continuing to improve our design, engineering, and manufacturing processes to go even further. W hat you see in the two figures above represents just one small part of the process. It is, however, a very important one. When a new valve is still in the design stage, we...

The Advantages of Thermoplastics Thermoplastics vs. Metal Understanding the benefits and limitations of both advanced thermoplastics and metals is essential to making an informed choice in valve materials. For services up to 250º F and pressures up to 230psi, thermoplastic valves outperform metal with respect to corrosion, abrasion and freeze resistance, and lower installed cost. Over 70 percent of all industrial valve applications fall within these ranges. In high pressure, high temperature applications, metals are your only choice. For all other process lines, from wet chlorine, plating...

Thermoplastic Materials The Benefits of Thermoplastics Materials Used in Asahi Valves The advantages of using thermoplastics are constantly being discovered. Over the past few years, there has been a dramatic increase in the application of thermoplastic valves and piping systems in areas where metal valves were thought to be the only solution. Even the most corrosion resistant metals are still susceptible to galvanic and electrolytic corrosion, resulting in scale build-up, which reduces flow rates and increases pressure drop. Asahi/America is actively trying to educate end users to upgrade...

Valve Types Thermoplastics Materials Used in Asahi Valves Product Discussion and Overview ELASTOMERIC AND OTHER MATERIALS (CONT.) Asahi/America thermoplastic valves provide a AFLAS®* (TFE Elastomer = Tetrafluoroethylene/propylene dipolymer) Properties: Wide varieties of chemicals, bleaches, pulp and paper liquids Temperature Range: Up to 450o F UHMWPE (Ultra High Molecular Weight Polyethylene) Properties: Abrasion and chemically resistant PDCPD (Polydicyclopentadiene) Properties: High impact resistance, high chemical corrosion resistance, high heat deflection temperature * Trade mark of...

Valve Types BUTTERFLY VALVES GLOBE VALVES The name of this valve comes from the wing-like action of the flow-controlling disc, which operates at right angles to the flow. The disc has about the same diameter as the connecting pipe, and the flow is straight through, with a low pressure drop. Maintenance is easy due to the small number of moving parts. The butterfly valve can be used either as an on/off or modulating type of valve. Asahi/America has recently developed the advanced Type-57 valve, which has no metal to media or environment contact whatsoever. These valves may be operated...

Valve Types PRESSURE RELIEF VALVES SIGHT GLASS GAUGE The thermoplastic pressure relief valve protects equipment and systems against overpressures or sudden pressure surges. Able to handle highly corrosive or ultrapure liquids, it prevents pumps from dead-heading due to unexpected shut-offs downstream (also known as a bypass relief valve). It maintains back pressure in closed-loop systems to make pumps run more smoothly (also known as a back pressure valve). The sight glass/gauge valve is the most convenient way to visually monitor the liquid level in tanks. Its thermoplastic construction...

Sizes: 1/2" – 6" Models: PVC & CPVC: Socket, Threaded and Flanged (ANSI) PP & PVDF: IPS and Metric (DIN) Socket, Threaded, Butt and Flanged (ANSI) Bodies: PVC, CPVC, PP and PVDF Seats: PTFE backed with EPDM or FKM Seals: EPDM or FKM or AFLAS®‡ Sizes 1/2" - 4" PVC/EPDM/FKM Models NSF-61 Certified ‡ Type-21/21A Ball Valve Standard Features (Sizes 1/2" – 6") Trademark of Asahi Glass Co., Ltd. Parts List (Sizes 1/2" – 2") • Pressure rated up to 230psi (PVC, CPVC, PVDF) • • • • • • • Double O-ring seals on stem for added protection Full bore, sizes 1/2" – 2" Full vacuum rated, all sizes Blocks...

Ball Valves Dimensions (Sizes 1/2" – 2") (in.) FLANGED ANSI CLASS 150 NOMINAL SIZE NOMINAL SIZE Note: The shape and appearance of assembly differ a little with nominal size compared to this drawing. www.asahi-america.com • asahi@asahi-america.com • Tel: 800-343-3618 • 781-321-5409 • Fax: 800-426-7058 2

Ball Valves PARTS (Different Numbers from 1/2"-2") PCS Dimensions (Sizes 2-1/2" – 4") (in.) For 6" size consult factory. FLANGED NOMINAL SIZE NOMINAL SIZE Note: The shape and appearance of assembly differ a little with nominal size compared to this drawing.

Ball Valves Pressure vs. Temperature (psi, water, non-shock) PVC Sample Specification All Type-21/21A ball valves, sizes 1/2” to 4”, shall be of true union design with two-way blocking capability. All O-rings shall be EPDM or FKM with PTFE seats. PTFE seats shall have elastomeric backing cushion of the same material as the valve seals. Stem shall have double O-rings and be of blowout-proof design. The valve handle shall double as carrier removal and/ or tightening tool. ISO mounting pad shall be integrally molded to valve body for actuation. PVC conforming to ASTM D1784 Cell Classification...

Type-21/21a Ball Valves for use with Sodium Hypochlorite Sizes: Models: Bodies: Seats: Seals: 1/2" – 4" PVC & CPVC: Socket, Threaded and Flanged (ANSI) PVC, CPVC PTFE backed with FKM FKM Sizes 1/2" - 4" PVC/FKM Models NSF-61 Certified The Type-21/21a ball valve can be factory equipped with a 1/8” vent hole for sodium hypochlorite applications. When a ball valve is closed, fluid gets trapped in the cavity of the ball. If the valve is not frequently operated, this trapped fluid begins to age and break down. As sodium hypochlorite breaks down, it begins to off-gas. This can create pressure in...